Apple has been sending out reminders to developers that iPhone OS 3.0 push notifications are now live, Ars Technica reports.
The coming push system works by leveraging both Apple’s push servers and another server used by the application developer. The third-party server monitors a background event — say, a new Facebook message, or an opponents move in a chess game — and sends a message to Apple’s servers, which then send a push message down to the appropriate iPhone or iPod touch.
Applications can display a message, play a sound, or update a red number badge on the home screen. Push notifications do require additional investment on the part of app developers — that third-party server has to be paid for somehow — but they allow users to be notified of background events.
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